John and I are both running the 8" TG double ended ram. I bought the TG kit, because I found it on sale Black Friday of last year. I would recommend you getting either a PSC or TG orbital. TG has an adapter to connect to your steering linkage and a bracket for installing the orbital and it takes...
Since you have a spare case it should make it a lot easier to get started. The only "special" tool you would need is a press. The rest of the job, like Ted said, is pretty straight forward. Also, if you are going to have the t-case apart, it would be a great time to put in a part time kit, if...